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t in (-oo:+oo)
99/25 = 6*t-((2/5)*t)+3/5 // - 6*t-((2/5)*t)+3/5
(2/5)*t-(6*t)+99/25-(3/5) = 0
(2/5)*t-6*t+99/25-3/5 = 0
84/25-28/5*t = 0 // - 84/25
-28/5*t = -84/25 // : -28/5
t = -84/25/(-28/5)
t = 3/5
t = 3/5
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